Question

When a prism is immersed in a fluid with an index of refraction
of 1.31 the internal reflections shown in Figure 26-48 are still
total. The reflections are no longer total, however, when the prism
is immersed in a fluid with n = 1.41. Use this information
to set upper and lower limits on the possible values of the prism's
index of refraction. (lower limit) (upper limit)